Hello,
I recently ported our GCC to new IRA by following mainline development. The
only interface I added is IRA_COVER_CLASSES. Our architecture has predicate
register file. When predicate register has to be spilled, the new IRA produces
inferior code to the old register allocator. The old allocator first tries to
spill to general register file, which is far cheaper on our architecture than
spilling to memory. The IRA always spills the predicate register to memory
directly.
#define IRA_COVER_CLASSES \
{ \
GR_REGS, PR_REGS, M_REGS, BXBC_REGS, LIM_REG_CLASSES \
}
Apart from above macro, what other interfaces/parameters I can tune to change
this behaviour in new IRA? Thanks in advance.
Happy New Year,
Bingfeng Mei
Broadcom UK.
